They pointed me to this story in the San Antonio Express-News. That story is a hit piece written by Joshua Fecther, evidently based on opposition research that the Davis campaign supplied him.

The story opens with a dramatic photo of some militia members who have been patrolling the Texas-Mexico border, captioned to demonize the guns they are holding.

Photos showing dozens of members of the militia groups on the U.S.-Mexico border carrying semi-automatic rifles and wearing masks, camouflage and tactical gear provide one of the first glimpses into the group's activities on the border.

Oooh, "semi-automatic rifles." Be afraid, be very afraid. If you don't know anything about firearms, anyway.

The story itself is about a campaign event at which Republican nominee Greg Abbott had a photo line, and a guy in the photo line turned out to be a militia guy, and he was later arrested on charges entirely unrelated to Abbott, his campaign, Second Amendment rights, or anything else. In fact, he has nothing at all to do with Abbott. He managed to get his photo taken with Abbott. That's it.